Part-Time Underwear

Should I wear an undershirt all the time or sometimes? My girl says that it is disgusting that I never wear one.

Disgusting? I don't think so, as long as you are clean and not dripping with perspiration. Undershirts are for comfort and warmth, not to be seen. Is there anything about your chest you're not telling me? Try wearing a wife-beater to bed, and maybe that will satisfy her.